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Comparison of 3-D and 2-D Cylindrical Symmetry FDTD Simulation Results of a Lightning Strike to Gaisberg With ALDIS Sensor Measurements
IEEE Transactions on Electromagnetic Compatibility ( IF 2.1 ) Pub Date : 2021-06-16 , DOI: 10.1109/temc.2021.3073787
Hannes Kohlmann , Wolfgang Schulz

In this article, numerical computations applying the finite-difference time-domain (FDTD) method are performed. Lightning electromagnetic fields radiated by a lightning strike to the Gaisberg Tower in Salzburg, Austria, and propagating over irregular terrain are calculated. The field propagation is computed with a three-dimensional (3-D) FDTD and, for comparison, a 2-D cylindrical symmetry FDTD. With topographic height maps, seven different propagation paths for a selected lightning strike to the Gaisberg tower are simulated and the resulting magnetic field (H-field) is compared with the received signal strength at seven sensors of the ALDIS sensor network for that event. The return stroke is represented by a transmission line model and the current waveform recorded at the top of the Gaisberg tower was used. The results of the 3D-FDTD simulation correlate well with H-fields registered at sensor sites in mountainous environments. Hence, 3D-FDTD can represent complex local reflection phenomena correctly, which the 2D-FDTD cannot. The results of recent studies, which show that a lightning strike to a mountain gives rise to a field enhancement at the sensor site for a relatively flat propagation path, could be verified by comparing the FDTD results with a set of existing sensor measurements. For the, otherwise, very hilly terrain conditions in Austria, the field enhancement caused by the mountain is attenuated along the paths to the respective sensors.

中文翻译:

使用 ALDIS 传感器测量对 Gaisberg 雷击的 3-D 和 2-D 圆柱对称 FDTD 模拟结果的比较

在本文中,执行应用有限差分时域 (FDTD) 方法的数值计算。计算了雷击辐射到奥地利萨尔茨堡盖斯伯格塔并在不规则地形上传播的闪电电磁场。场传播是用三维 (3-D) FDTD 计算的,为了比较,使用二维圆柱对称 FDTD。使用地形高度图,模拟选定雷击到 Gaisberg 塔的七种不同传播路径,并将产生的磁场(H 场)与该事件的 ALDIS 传感器网络的七个传感器的接收信号强度进行比较。回程由传输线模型表示,并使用了盖斯伯格塔顶部记录的电流波形。3D-FDTD 模拟的结果与山区环境中传感器站点记录的 H 场密切相关。因此,3D-FDTD 可以正确表示复杂的局部反射现象,而 2D-FDTD 则不能。最近的研究结果表明,对于相对平坦的传播路径,山上的雷击会在传感器站点产生场增强,可以通过将 FDTD 结果与一组现有传感器测量结果进行比较来验证。对于奥地利非常多山的地形条件,由山引起的场增强沿着通往相应传感器的路径衰减。最近的研究结果表明,雷击山峰会在相对平坦的传播路径的传感器位置产生场增强,可以通过将 FDTD 结果与一组现有传感器测量值进行比较来验证。对于奥地利非常多山的地形条件,由山引起的场增强沿着通往相应传感器的路径衰减。最近的研究结果表明,对于相对平坦的传播路径,山上的雷击会在传感器站点产生场增强,可以通过将 FDTD 结果与一组现有传感器测量结果进行比较来验证。对于奥地利非常多山的地形条件,由山引起的场增强沿着通往相应传感器的路径衰减。
更新日期:2021-06-16
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